can: kvaser_usb: Don't send a RESET_CHIP for non-existing channels

Recent Leaf firmware versions (>= 3.1.557) do not allow to send
commands for non-existing channels.  If a command is sent for a
non-existing channel, the firmware crashes.

Reported-by: Christopher Storah <Christopher.Storah@invetech.com.au>
Signed-off-by: Olivier Sobrie <olivier@sobrie.be>
Signed-off-by: Ahmed S. Darwish <ahmed.darwish@valeo.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

diff --git a/drivers/net/can/usb/kvaser_usb.c b/drivers/net/can/usb/kvaser_usb.c
index 9accc8272c274accbc856066eca45d198d403c11..cc7bfc0c0a7134cfeb54362ebf49b76364f5e13d 100644 (file)
--- a/drivers/net/can/usb/kvaser_usb.c
+++ b/drivers/net/can/usb/kvaser_usb.c
@@ -1503,6 +1503,10 @@ static int kvaser_usb_init_one(struct usb_interface *intf,
        struct kvaser_usb_net_priv *priv;
        int i, err;
 
+       err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
+       if (err)
+               return err;
+
        netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
        if (!netdev) {
                dev_err(&intf->dev, "Cannot alloc candev\n");
@@ -1607,9 +1611,6 @@ static int kvaser_usb_probe(struct usb_interface *intf,
 
        usb_set_intfdata(intf, dev);
 
-       for (i = 0; i < MAX_NET_DEVICES; i++)
-               kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
-
        err = kvaser_usb_get_software_info(dev);
        if (err) {
                dev_err(&intf->dev,